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Swabs turning round and round...
https://www.pennlive.com/coronavirus/2022/08/was-your-at-home-rapid-antigen-covid-19-test-negative-do-it-again-fda-says.html
I took two tests when I was already symptomatic that turned out negative. Now we know that we can test positive long after we are symptomatic or contagious. The rapid tests are horsecrap.
Well, the ones you get for free are. Our stuff is a bit better, but you still have a high negative rate on the lateral flow stuff.